Electrical Installation; Power Supply Cable Connection; Electric System; Electric Protections - DAB SM series Installationsanweisung Und Wartung

Flanges should be provided with suited slots
to accommodate the wires.
During the assembling use a suspension ring
fastened to the column pipe, to avoid
dropping the pump in the well in case of hoist
failure or chain breaking .

6. ELECTRICAL INSTALLATION

ATTENTION!
ALWAYS RESPECT THE SAFETY
REGULATIONS!!
Electrical installation must be carried out by an
expert, authorised electrician, who takes on all
responsibility.
Attenersi scrupolosamente alle istruzioni del
costruttore del motore e delle apparecchiature
elettriche.
THE
CORRECTLY
EARTHED!!
Always switch off the mains power supply before
working on the electrical or mechanical part of the
system and make sure it cannot be switched on
again accidentally.
We recommend to install upstream the motor a
–
safety switch to protect the motor against voltage
drop or overload.
Refer to voltage data on motor nameplate for its
–
correct sizing.
Leave 2 or 3 meters of cable more in case the
–
terminal connection should be changed.

6.1 Power supply cable connection

The supply cable should be selected according to the
Ampere flow, showed on motor nameplate.
If the cable is not supplied with the motor, it should
suit the following requirement:
Its section should correspond to the one
a)
recommended by the motor manufacturer
according to carried power, installation depth
and motor starting system .
b) Warranty required: up to 600V in water.
c) Motor connection should be performed with
extreme care.
d) The cable should show no cuts, cracks, scratches
or other damages.
If two cables have to be joined in parallel, pay extreme
attention when connecting cables of the same color.
SYSTEM MUST
AND SAFELY
ENGLISH

6.2 Electric system

The motor is connected by the supply cable to the control
panel which contains the necessary control and
protection devices.
mechanical or electric, will damage almost automatically
the motor windings, it is necessary for the control and
protection equipment to be adequate and reliable.
Economy may, in this case, produce unpleasant results.
We recommend besides an efficient grounding of the
control panel .

6.3 Electric protections

In all case of:
DOL starting,
–
– Star/ Delta starting,
– Stator starting,
– Autotrasformer,
Are necessary:
– An overload protection.
A short circuit protection.
–
such protections should trip on all three phases.
BE
We suggest besides protections against:
– Phase drop.
– Voltage drop.
– Water level drop.

6.4 Rotation direction

Check motor rotation direction before coupling the
motor to the pump, so to avoid any damage to motor
thrust bearing.
Find and mark by means of cyclic
phase indicator, whose pointer is turning
clockwise, mains terminals L1, L2 and
L3 and connect them to control panel
terminals L1, L2 and L3.
Electropumps turning in a counter-
clockwise direction viewed from the
delivery mouth
Connection
Electrical
equipment
20
Since every difficulty,
Electropumps turning in a clockwise
direction viewed from the delivery
Star/delta starting
Motor cables are marked
with letters U1-V1-W1 and
U2-V2-W2. They have to be
connected to control panel
terminals, respectively: U1-
V1- W1 and U2-V2-W2
for clockwise
(seen from motor/pump
coupling)
.
In case of counterclockwise
rotation, reverse
U1-V1 and U2- W2.
either
rotation
terminals